On the 1.7 Demo I tried creating a new event in both Firefox 2 and MSIE 7.
Firefox 2 works as expected.
In MSIE7 step 4 does not display the enable online registration box on the page. I've attached a screen capture of what should be step 4 of the new event wizard.
I've attached a screenshot of the Step 4 page and also a quicktime screen capture.